Lochinvar FTxl 400 Installation & Operation Manual page 34

5
Vertical direct venting
Vertical termination – optional concentric vent: Models 400 - 600 Only
Do not operate the appliance with
WARNING
the rain cap removed or recirculation
of combustion products may occur.
Water may also collect inside the larger
combustion air pipe and fl ow to the
burner enclosure. Failure to follow this
warning could result in product damage
or improper operation, personal injury,
or death.
4. Install the Y concentric fi tting pipe assembly up through
the structure's hole and fi eld supplied roof boot/fl ashing.
Do not allow insulation or other materials
NOTICE
to accumulate inside the pipe assembly
when installing through the hole.
5. Secure the assembly to the roof structure as shown
below in FIG. 5-6 using fi eld supplied metal strapping or
equivalent support material.
Figure 5-6 Concentric Vent Roof Installation
Ensure termination height is above the
NOTICE
roof surface or anticipated snow level
(12 inches (305 mm) in U.S.A. or 18
inches (457 mm) in Canada) as shown in
FIG. 5-4, page 33.
If assembly is too short to meet height
NOTICE
requirement, the two (2) pipes supplied
in the kit may be replaced by using the
same diameter, fi eld supplied standard
schedule 40 PVC for CVK3007. Do not
extend dimension D* more than 60 inches
(1524 mm) (see FIG. 4-9, page 29).
34
Installation & Operation Manual
DO NOT use fi eld-supplied couplings
CAUTION
to extend pipes. Airfl ow restriction will
occur.
6. Install the rain cap and the small diameter pipe assembly
into the roof penetration assembly. Ensure the small
diameter pipe is fastened tightly into the rubber adapter
for #CVK3007 installations.
7. Cement the appliance combustion air and vent pipes to
the concentric vent termination assembly. See FIG. 5-6
for proper pipe attachment.
8. Operate the appliance through one (1) heat cycle to ensure
combustion air and vent pipes are properly connected to
the concentric vent termination connections.
Multiventing vertical terminations
When two (2) or more direct vent appliances are vented
near each other, each appliance must be individually vented
(see FIG. 5-7). NEVER common vent or breach vent this
appliance. When two (2) or more direct vent appliances
are vented near each other, two (2) vent terminations may
be installed as shown in FIG. 5-7. It is important that vent
terminations be made as shown to avoid recirculation of fl ue
gases.
Figure 5-7 Concentric Vent and Combustion Air Vertical
Termination